Abstract
Soy isoflavones may impede atherogenic processes associated with cardiovascular disease. Research suggests that the postprandial generation of TG-rich remnants contributes to the development of atherosclerosis. The purpose of the current study was to determine if 39 g soy (85 mg aglycone isoflavones, treatment) compared with 40 g milk protein (0 mg aglycone isoflavones, control) in combination with a high-fat meal can modify postprandial, atherogenic-associated events and biomarkers for oxidative stress, inflammation, and thrombosis. Fifteen healthy men (20–47 yr) participated in a double-blind cross-over meal-challenge study occurring on two nonconsecutive days. The study meals consisted of two high-fat apple muffins consumed with either a soy or milk shake (229 mL, 41% fat, 41% carbohydrate, and 18% protein). Blood samples were obtained at base-line (fasted) and hours two, four, and six postprandial. Plasma TG significantly increased in both treatment and control meal challenges compared with baseline. There were no significant differences (P>0.05) between treatment (soy) and control (milk) for ex vivo copper-induced LDL oxidation, serum C-reactive protein, serum interleukin-6 (IL-6), serum fibrinogen, or plasma lipids (total cholesterol, HDL, LDL, TG). IL-6-concentrations significantly decreased as a function of time during either meal challenge (P=0.005). These data suggest that consumption of soy or milk protein in conjunction with a high-fat meal does not acutely modify postprandial oxidative stress, inflammation, or plasma lipid concentrations in young, healthy men.
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Abbreviations
- AUC:
-
area under the curve
- BMI:
-
body mass index
- CRP:
-
C-reactive protein
- CVD:
-
cardiovascular disease
- HI:
-
high isoflavone
- IL-6:
-
interleukin-6
- LI:
-
low isoflavone
- NRL:
-
Nutrition Research Laboratory
- PGF2α :
-
prostaglandin F2α
- T0:
-
time point hour 0, pre-meal challenge
- T2, T4, T6:
-
time point hours 2, 4, 6 post-meal challenge, respectively
- TC:
-
total cholesterol
- TNF-α:
-
tumor necrosis factor-α
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Campbell, C.G., Brown, B.D., Dufner, D. et al. Effects of soy or milk protein durign a high-fat feeding challenge on oxidative stress, inflammation, and lipids in healthy men. Lipids 41, 257–265 (2006). https://doi.org/10.1007/s11745-006-5095-5
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DOI: https://doi.org/10.1007/s11745-006-5095-5